Preparation of YAG powder by co-precipitation method in a narrow pH-change environment

Abstract

YAG (Y₃Al₅O₁₂) powder was prepared by co-precipitation method. To avoid pH values changing intensely during titration process, the NH₄HCO₃ solution with NH₄NO₃ was used as precipitant solution. The pH change of precipitant solution during titration process, compositions of precursor, phase formation process and morphology of the prepared powder were investigated by means of pH meter, FT-IR, XRD and TEM. The results show that the presence of NH₄NO₃ in NH₄HCO₃ solution is crucial to alleviate the pH change, lower the calcination temperature and meliorate the morphology of YAG powder. The mechanisms were studied in detail. The YAG phase can be obtained at a lower temperature of 900 °C. The obtained powder, composed of elliptical particles, showed a meliorated morphology.

Keywords

precipitation / chemistry / powder / ceramics

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